class_docstr: Serializes any CheckFailure instance into html format.
  
  Parameters
  ----------
  value : CheckFailure
      CheckFailure instance that needed to be serialized.
docstr: Prepare the header section of the html output.
docstr_tok: ["Prepare","the","header","section","of","the","html","output","."]
code: def prepare_header(self, output_id: Optional[str] = None) -> str:
      """Prepare the header section of the html output."""
      header = self.value.get_header()
      header = f"<b>{header}</b>"
      if output_id is not None:
          check_id = self.value.get_check_id(output_id)
          return f'<h4 id="{check_id}">{header}</h4>'
      else:
          return f"<h4>{header}</h4>"
  
file_path: deepchecks/deepchecks/core/serialization/check_failure/html.py
imports: from typing import Optional
  from deepchecks.core import check_result
  from deepchecks.core.serialization.abc import HtmlSerializer
label_desc: Use image node_id 3 for calling the CheckFailureSerializer obj's underlying member method code with example usage: obj.prepare_header(output_id) and returns: str, check_id, str, header, str, str, header, str